Send an e-mail with PHP

index.php

<?php
if(isset($_POST['email'])) {
    $name = trim($_POST['name']);
    $email = trim($_POST['email']);
    $subject = trim($_POST['subject']);
    $message  = trim($_POST['message']);
    if (preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$/i", $email)) {
        $to = "me@example.com";
         
        $email_subject = "Contact Form Submission | $name";
         
        $email_body = "You have received a new message.\n\n".
        "Name: $name \n".
        "E-mail: $email\n\n".
        "Message:\n".
        "$message";

        $headers = "From: $email\n"; 
        $headers .= "Reply-To: $email";
        mail($to,$email_subject,$email_body,$headers);
    }
}
?>

That's soooo open to spam be careful